The adults of Nearctic members of the genus Antherophagus Dejean (Coleoptera: Cryptophagidae) are diagnosed and illustrated, and a key to species is provided. The distributions of the five Nearctic species, Antherophagus convexulus LeConte, Antherophagus ochraceus Melsheimer, Antherophagus pallidivestis Casey, Antherophagus ruficornis Grouvelle, and Antherophagus suturalis Mäklin, are summarized. Host associations are also provided for A. ochraceus, A. pallidivestis, and A. suturalis. Several new state records are reported: A. pallidivestis is recorded for the first time in Idaho, Montana, and Wyoming; A. suturalis is recorded for the first time in Montana and Wyoming; A. convexulus is reported for the first time from Colorado. Many new county records are reported for A. ochraceus, A. pallidivestis, and A. suturalis. Antherophagus ochraceus subnitidus Grouvelle, 1911 is placed as incertae sedis.